Pulp-screening machine



A. J. HAUG PULP S CREENING MACHINE Filed om. 11, 1924 f5 SheeJcs--Sh'eet l,

Sept. l, 1925.

A. J. HAUG PULP SCREENING MACHINE I Filed Oct. 11. 1924 5 Sheets-Sheet 2 lInventor:

Sep@ "i, m25. 1,551,953

A. 1. HAU@ l PULP SCREENING MACHINE Filed Octn ll, 1924 5 Sheetshee, 3

@mentari 5 Sheets-Sheet 1.

l Inventar.'

A. J. HAUG PULP SCREENING MACHINE Filed oct. 11,

Sept. 1, 1925."

A. J- HAUG PULPl scREENZING MACHINE Sept-1, 1925.

'Filed oct. 11,

1924 i 5 Sheets-Sheet 5 Inventor *ffwf al@ Mns.

Patented Sept. l, 1925.

'del ANTON il. HAUS, 0F NAS/HUA., NEW IETMSHIRE.

Application :tiled October 11, 1924. Serial We. /itw.

To all Awho/1n it may concern;

Be it known that LANTON J. HAUe, a citizen ot the United States, residing at- Nashua, in the county of Hillsborough and State of New Hampshire, have invented certain new and useful Improvements in Pulp- Screening Machines, of which the following is a specification.

This invention relates to processes of screening pulp and to machines for screening pulp through a rapidly rotating screen against 'a hydraulic head. My invention, however, may be used for screening other materials and some features thereof may be used in machines of other types.

In screening pulp it is important to produce a maximum of suitable screened stock Iwith a'ininimum expenditure of power and u minimum oit-good stockin the tailings. A. rejection ot good stock is serious not only as requiring subsequent screening and ren lining processes for its recovery, but because the longest and leest ibres are likely to he destroyed in such subsequent operations. The present invention is directed to improveniente whereby a large volume of pulp can he screened with a low percentage of power expenditure and with a very low percentage or' good stock being rejected and passed along with the tailings. l

lt is a further object of this invention to devise a pulp screening machine which will elevate the screened stock or tailings, or both, to such a height that they can be fed `to another machine located on substantially the same level without requiring the use of pumps or other elevating apparatus. Other improvements will appear from the specification.

This invention constitutes in many respects an improvement upon my co-pending application Serial No; 456,374, tiled March 2S. 1921A. i

The nature of the invention will loe readily understood 4from thefollowing description when read in connection with the accorn- -panying drawings, and the novel features will be partici lai-ly pointed out inthe appended claims. i

Referring now to the drawings,

Figure l is a side elevation, partly in cross-section, of a pul screening machine embodying the present invention;

'arrangement which may loe View, partly in crossn Fig. 2 is an end section, of the machine shown in Fig. l;

Fig. 3 is a vertical, central, cross-sectimiall "rangement which may loe used to apply hack. pressure to the `tailings or screened stock;

Fig. '7 is a plan view of a part of the mechanism shown in Fig. G; y

Fig. 8 is a perspective view of the blade 'l ho taiiings 'from the screen Fig. i is a cross-sectional View on a larger scale et the packing arrangement used at one end oi the screen; and

Fig. l() is a composite crosssectional view oi the packing mechanism, divided into four quadrants, the plane oit' section of the quad rant A 4being indicated in Figli) by the line a-m that of the quadrant E hy the line l)-; that of the quadrant C hy the line and that of the quadrant l) by the line cil-4Z. l

The machine shown duplex type including two separate screen ing machines or units A and B which are substantially identical in construction, both units being supported on u base 2 and driven by'helt Yconnections to a central pulley 3. The other figures of the drawings show the details of one unit only.

Referring more particularly to Figs. 3 and 4, itV will be seen that each screening machine includes a stationary casing comprising ends 5 and 6 and a shell 7. Mounted Within the casing is a. rotary .screening cylinder 8 which is bolted to the i'iange of an end piece 9 mounted on the shaft ILC to which the pulley 3 is secured.

in Fig. l is ofthe The paper stock or other material to be y as`pnlp.

screened, hereinafter referred to is conducted into the open end ofthe screen through-a spout 12 and this spout, as here used to ejectl ias shown,eneiielesa and is formed. iniiegrz.

A i with, a'stationary tailings eoncluifb or chute 14; *ahnt extends axially through the screen. Vif'hen the machine is :in operation the screen 8 is roi-ated with sufficient'y Speed to produce a subs initial centrifugal eli'eet on the pulp in eentaot tl'ierewith, und the centrifugal force so created. 'forces die pulp through the screen and disenerges it 'from the. casino 7. The screened pulp finds en outlet et i5, l, 2 :mal Li, and .is haelfefi up in the Casing; by a Weir 16 sothnt the sereen is submerged in sereenel pulp. The Weir is vertical@ mi justoie by the usuel mechanism including mha'nrl Wh ei l?. eiar'ie'en is an importen@ femore in the op eration of ihis apparatus and the Weir "should he adjusted et suoli a heigh ite 'ensnr such submergeiiee nml prevent the tendency of J{,he pulp to inet or :adhere io the inside of the screen, 'which would lmppen .if the screen were not submerged, i'inri that 'when the Screen is so?, s'riimierge thekilbres form) in efliey, e i l inside (yf-the'screen so that l" Water Comes Johrouglri On he with the ,screen suhine igei; 'eve fibres pass freely thi'ongh ihr satisfeefory head 'for ehe screened stoel( Varies according-wille screen :speefjl anzi other eondiiiolisf hilt can reafiiilr he (leienmined in pre tice. i. here oleriiineci very satisfactory results hy rumene;` a screen oi" Z7- inehes in diameter ai. 28() revolutions per 'minnie under anheeil nii 193e inches sbreenecl stoel; abore vihe center of ille sereen.

ln order to Clear rhe screen 8 o1" lmes, slivers, and other materials which. Wiil not pass through the meshes, one er more here. 20 are mounizecl'nloee io ihe inner en: o' thev screen, her heine* sui at one emi by im i' flange 21 which elle duit, and :1t ite other emi by Circular plete or "partition 22 which seeurefl *o the con duit le 21ml proj@ s almost ro the inner surface of the screen. if desired en erro similar to i9 emi sixnilirriy secured may he used in plzree of sniil piwiition. Each, oi' hese bars is inclined rearwardly so hnli es the 'teilin strike them, 'the mrs 'will force the tailings toward he milings onilei'. at the righi-hand enel, screen. This `irrenggl'eiheni.y ihrrefore, results in continuously moving) vhe aiong's along` the. suri'aee of ihe sei-een in on in (leiter-minute path .towerfl Lhe lailihggsnonilet, the raie of this lnovemem, heine grenier :1s the degree oi ineiinfition of "el e oars increased.

The partition 2Q performs the flonhlz, 'function oi supporting' the hors 2() :and pre 'reniingg goofl stoel: from splashing past the partition where it would he mixed with (he The ril'mierg/enee of the sereening` operan-m takes pier Y,

F1o' in 'whin ci einher 23; are Weshecl iis. o,

any' goo muy " eli the LQ i* Uf howe i ion if iiesireo, as lie usually proceed well enough. rciizhougt dividing the interim' oili the screen, into ehaiiohers. of washing the tailings, 'Water under pire-esure ie conducted hrorlgrh n pipe. fl zlo an annuler easing; S25 having u seri-es i, holes 26 in iisg peripheral eige thro l iieh the 'freier iS ilisehsrgecl. V

.rnie'f Strike ",ioimrjf deiieig-lors onine:

breek op 'the srreuins into spiny and r reet il; on to the. stoel; carried oy lle inner snr'faee of die screen. This sprav washes ihe greater part of -he goed stom onli oi ilie billings anni mieles sneh stoel; to pes, hio'rrwh alliesereeuh IThe tailings next t inkom-Binet with e. series oi inrofl hr' v C3 'Joehoe :mii ilrrongh the f eci in a freir 2X2; ini@ lll disel'iu'f'o'es3 Weir h means of e, :1nd 'wheel be. oif the Diaries 12S is sueh il el; es he rnpiiilr rotating stoeinilien consisting onlj,Y oilf eiings,'is hrougfrlv iii Contact with them` they eject ille railings 'w'ihy sullicienlz- 9 sure to force them through ihe (lischurge noiialui'r, ifo afliu ihn 'he rgefl :i gai nsr minnie n, heui ol of the easing? has r lhis is consider Y prior nim-hiere o; which l am aware :ir-fl, peii'nirs lhe chin-,qe of the nilingshy gravity to another inni on i'he same floor. n

ln order to Wash lhe swoon 'fi ni; iniieivnls, if desired, :rehearing apparatus ifnomiie l in the easing l :l und This al par: ins eoin'nrises e housing S5 holted to the easing 7 nml pipe 3h Steine' Within said housing' :infl nrrhnggenl to rotate about its longitudinal exis, i'lhis pipe heim;y provided with spray openings; T57. Pipe emmee'rione Iii. Figs. l and eomluel: w ter to The pipe Il'. yi`he 'pipe has :i hnmllri l, seenzvil ihnre- 'to h3' moons oi -which il: muy he roi'uleel lo lering he openings S7 either iiio regiser .viinh :i sluit Il() in Vlhe inner #hie oi the hou# ing, Where the spray will he ilireel'ul against one fooi, e heen 'found lili lli, or il@ move said cui, all lili@ spray. mmvi'iuiim spraying i e liolliml im the stntio1i ssii/ss of mcliul is Jiiiefl in *the disk ifi di ng L miner lig; pmiiiioi'is 530i :1mi tlm ducts open :ii llilsii. who? muis into lili@ Spaciis l'ietwcm in the ilialr: 1li", iiliilo mi; @ii iiiiiaii mi miimuiiiiiito willi the Vim il 'Uw Enum si ii? 'Elie blnles 491i. l willi am i'iilugnl i mi im mi mi my fluid with which -ii'viii i'uliti'iafli, illus forcing iliizl; :Lii 5U nulli?? luid lirougfli lle (luclsll und. im@ iii-u annular fsliun'ibez in 'which 'inl l revolve. lrli two pumps, L" @A me iii :ici-ies? lie outliJ olf tlm .flif:1^0'iiig' iiiioliie inlet 0l the umili an liquid 110ml-- ii mv/,lumix lgjitween 'ille blades by iiw nii' n i, uw sw/alieni by 'alle pielwi'nlily i5 wecmeilio tlm "-i i. 'loll by a sationmy im iiiiiziidly nx'mming :Einige iis iimm' miga. The ring 52 imi; :i wir. ,L'iiiiiige 'which operati@ in cas@ my *fr* i' u um it im throw suoli Water ifm a;:ai.i,i1. im iriiig i@ Wham it 'mima flown" tn @lie lower side and escapes t'iirouggli Elie pol-: 5&7 Fig. 9. i.

'lliis imm 0l jgzmking is: Qiiitimilzirly usiiful in la n'izichino oli nis @hara/lim' since it re cliiciis the friction lUSSQS, amil liano-e amilomirfzeifs powi. Fiii'ilim-moi'e, will lust in flul'inilly und lifliiils tlm namisiiiy for rv mwah l packing' 0l the :Ruime guuerzil cmiistru" tion including` blades LM and l5 if; employed nfl; die le'lfbhziml and. of the sirifn, Fig; 3, f

but the Sci'vn @pail :it this-0nd loi' the in. flow oi: pulp, Li Stiitiimm'y plate or pail'- tiiion living piiifideal to retain the Stock 'in die suiwil. This jpaitibiim secured lo ihn' spout 12, and luis; mi opening; at im); d2-r Siicil point, :iS for iiisziiiiL-Q at 55 to admit the Stock i0 lw Scmxioil. The @Snipe of Stock bewevn vtlm pzutibim'i 55 and the liminlzu @mi plata :3T of the scream 'is prfsventecl by fi serias 0l lxlmls 5S Secure/(l to said. plate 57, ilwSo lilziilos: boing siii'iiliu to the blades 44,

Since with sci'cim is filijliimiloil iii; one mul only lie ii'mcliin lends .il-Self with piitimb lui :u om pair 0l' lucz'iiiiigs-i mul sini pulley only being is uf Sii-,ieiiing in zicliinew lf/i" immun-i im #he in ,liiiie lm ply as zi pulley, @ther cli lf3 dliving :Salio two ijili-u driving wen Shown Simu allgement;

may bi1, me l, as im* czieiiiiplfii iliifact motor drive. is conmnpzisd that sucia. :i drive could be iisil byfiliifidinq lille screen :illiift ,into saai/ions instzil f inl'iiiling it in. ai Single piece, the motor faliziflt m'miifig one emotion 0l' the Slm'ft for the imii'e. machine.

Notwiilistfmding the advmmge of the cmnbinalion of two screens A :incl B in one dupli Screen, it is not necessaiy i-O employ suoli :i coiii'abimtii'm, as with the screw A m' Screen il @mittal entirely kthe iuziiiii'ng screen will vas-ily screen li'ity tous per day 51ml it a wry l0w"w1p feml-iiuw of powcr par ion. in immy insia-llziiviois., it will in@ lfmid ilesizzilil in uw ai single screen ":i'lwa an ilie duplex ifimliiiiziijoii.

ln u 111g the machine misifler il, pfeifit is more corivmii/nt if@ adjust the height of *die weil' than, *lo chang@ the sped 0l* the machine, The .iraitiimv 03- tlie pulp 'al'irough tlm @craie/ii may @lier for@ be com ti'ollal iiumielggl-mid, this; im mpmtaiiiii:

,eig i 'manege tage in. protlueing tleeirecl screening he applied to 'the tailiuge effect, and iiik preventing the :matting or 'the libres on -he screen. The rete of rotation oli the screen may be 'varied within rele.- t-ively wide limits7 but should he sullicieut to create Substantial centrifugal el'ect on the stoel; in commet therewith. liu practice final that d` peripheral speefl or' approximately 1800 per minute gives satisfactory reeulte,

i that both 'the tailings and screened e-,oelt nre lifted to e, level above the top of the screen is en importent practical *ege since itperulits the delivery, by gre/ley, et both these materials to other me chinees located ou the seme llover with the pulp screen. illithut this arrangement it would he necessary to use pumpe or seme other apparatus for raising these materiels to the desired level.

r"he applia'tion off e. heel; pressure to either the screened steek or 'the tailings may l e regulated in other than that above tleeeiiheth For exemple, lmel; pressure may hy locating :1 piloted Vane 60, Figs. 6 :und T, in t-lie 'tuilingrs 'conduit if elile weight, 6i on fm :um (SQ.- whieli is seemed lo 'the rook shaft. that. siqiports the rime, se that Constant pressure will el'wnps lie zippliecl to the vene und he :e to the stream el" "des liowiiig Heiler it.. The sume :nu

eut may he useiil in, the outlet ,lor ihrx s tl steek. Usually, however, it 'is prefl 't'or the reueorie nhove tleeeriheil to use e machine liftS proved il; prat-tive to he very economical of power :mtl it lane u ver? high screening Capacity Afor a, given :1I-w1, apparent-ly clue to the hurt that. 'the entire screifiingb; surface is olivzztyfiiseil mi the Screen is ezzmrlihly Lifi-ee of tailinghy eetl mets e e wlii ih oihmwvise would. seriously interfere with the .screening operation.v u further mirante-re osi this muehiie is. 'that lheri-:oovei of the tailings -from the screen etifecteil wiihout. interfering zipprecizilily with the flow ol the stoel( through the Screen voiler the action or reir torce, and 'without creating' :my mater ml turbulence or :mit ation o? the sleek.

will loe observed llmt the moi-hills shown emhoiliee mamy ol' ille leu'ures of the iin-'entiereV iliseleeed in my prior appliinion ehove tlesfgmitml, :mil in this stoere the present :ippiirutiou :i 1 -o`witimmiion ol' my prior zipplivation. The liroml fclnimev coveinf" Subject welter -r-oinmon to the two :ip plieutions :ire presented in my earlier mso., above tlesigunteih the claims of this: application heilig; confined to those tentures which are not ilisclosezl in my former fippli/ ration.

Haring time ileerfoetl my mventiol., what, desire to chum :is vnew :wel mriuigiiig an, etljusti il. ln a, pulp screening machine, the eomhinsrtion of a rotary Screen, means for rotating said screen, means for conducting pulp to he screened into the screen, a stationery contluit'mounte Within said screen and eze tending longitudinally thereofa und :1, plu relityef bars supported by seid conduit and located closely edge-cent to the inner Surface of said sereen, seid hars ext/ending longitu clin :illy et the screen and being inclined. with referente to the exis of seid screen.

2, in a pulp screening machin@ the oomhirlzftion of e rotery screen, mea-oey for rotating 'the seme, ineens flor eonclilotiug pulp to he screened into said sereeme com duit for conducting tailings out/ef saidl screen, means Within 'the screen for advancing the tailings along the screenin I surface tvo-Ward the int-alie enel. of Seid4 con uit, and ineens external to the screen for resisting the discharge of the tailings through said confiait.

2h in e plop sereeriing meohne, the combination of e. rotary screen, means for retelling the seine, means forV conducting pulp to he :screened int Seid screen, a Contluii for Conducting tailings out, of seid screen, means Within the screen 'for advenir ingr the tailings along the screening surface toward the intake end of sait] Conduit` :11ml :i Weir et, the discharge emi or' said conduit over .vhieh the tailings are discharged :it :1 level above the top ol" the screen.

elo

l. in :i pulp screening nmohine, the Com- Mention of n, rotary Sri-een, means Yfor rotniing the reune, a .usiing in which the Screen is mounted, menos for conducting pulp into smid sii-een, u, plurality of stationery here mounted in Seial screen closely adjacent to the screeningl Surface and so inelinetl as te urge the tailings along' the slirteee of the Screen towel-tl the tailings outlet, mtl e series of stationery inclined blames mounted within snitl screen neer said outlet for directing the tailings into seid oirtlel.

ln zx pulp Screening machine, the eembiiiutiou of e rotary Screen, it stationery iulet. :i tailings outlehy means Jfor rotating Suhl screen, menne Within Seial screen for oireot# ing the tailings along the Surface or' the srreen toivnril Seial outlet, :i conduit into which the tailings ejected through siitl outlet :ire tlischarffed, mamie external to the si-reen for applying hack pressure to said lll() llO 6. ln n pulp screening machin@ the combination of a, rotary Sere-en, moons for r0- tutihg 'the Same, menus lor conducting pulp to he screened inte seid screen, e conduit for conducting tailings away from said Screen, melius within the Screen for advancing the tailings alongthe surfer-,e of the Screen toward the intake end ot Seid conduit, o. Weir et the discharge end ot' suid Conduit,

the Screened said casing having' a discharge outlet for the screened pulp, and a Weir over which pulp is discharged, the latter Weir and said iasing'-lieing arranged to maintain said screen sulnnerged in screened pulp.

7. ln a pulp screeningl machine, the com'- hination oi a rotary screen, means 'for rotating `ihe .same` a partition dividing the space '1u said screen into two chambers,

means .for conducting pulp to he screened into one of said chambers, means for forcing the tailings into the second chamber, and means Ytor Washing the tailings in said second Chambon 8. l'n a pulp screening machine, the comhinatiou of a rotary screen, means for rotating' the same, a casing in which lsaid screen is mounted, a stationary spout for conducting pulp into one end of said screen, a stationary conduit for conducting tailings away from said screen, a plurality of stationary hars n'iountcd in said screen closely adjacent to the ecreening,T surface thereof and so inclined as to direct the tailings alone; the surface oi the screen toward one enc thereof, a spraying apparatus positioned in said screen at Athe latter end and arranged 'to direct a spray against the tailings, and a series of inclined blades for acting' on the tailings at the latter end of the screen to direct them into said conduitA ln a pulp screening machine, the combination of a rotary screen, means lor rotat-ing,r the same, a casing in Which said screen is mounted, a stationary spout disconnected from said screen i'or conducting pulp into one end of said screen, a stationary conduit For conducting tailings away from said screen, a plurality of stationary hars mounted in said screen closely adjacent to the screening' surface thereof and so inclined as to direct the tailings along' the surface of the screen toward ono end thereof, a partition extending transversely across said screen and dividing;- the space therein into a chamber which receives the pulp and a second chamber into which the tailings are Clirccied hy said liars, means Within said ,second chamber 'for wasl'iing,r the tailings,'and a series ol stationary blades arranged to engage the tailings and to utilize the rotary movement imparted to them by the screen to eject them through said conduit. p'

1,0. In a pulp screening machine,I the comhinatonv of a screen, a housing mounted adjacent to the same and extending longitudi,- nelly of the screen at one side thereof, a spray pipe litting in said housing and mounted for rotative adjustment about its longitudinal axis, and means for conducting water to said pipe, said housing being apertured in the side ther-col" adjacent to said ecreen, and said pipe having' spray openings therein, whereby said pipe may he :1d--

j usted to direct a spray through the apepture of said housing or to cut oli' said sprays` l1. In a pulp screening/machine, the dome i hination of a screen, same, and means for ejecting the tai ings from said screen in' a. substantially continuous stream and lifting said tailings to a point above the level of the screen.

ln a pulp screening machine, the combination of a rotary screen, means f or ro tating said screen, means for conducting pulp to he screened into said screen, a conduit for conducting the tailings away from said screen, and means for forcing the tailings through said conduit in a continuous stream and lifting them to a point alcove the level'of the screen.'

13. ln a pulp screening machine, the combination of a rotary screen, means for rotating said screen, and means for utilizing the motion of the screen to force the tailings out of the'screen in a continuous stream and to lift them to point above the level of the screen. 4

i4. That :improvement in the process of screening pulp vwhich consis in performing the screening operation by centrifugal force created by the motion of the screen, and utilizingr said motion to eject the tailin s from the screening surface and to raise t e tailings to apoint above the level of the screen.

15. ln a, pulp screening' machine, the comhination o a rotary screen, a casing in 'which said screen is mounted, a shaft supporting one end only of said screen, the opposite end of the screen being unsup ported, a stationary plate partially closing the latter end of the screen and having an opening therethrough, and 'a spout communicating with said opening for conducting pulp into said screen.

16. In a pulp screening machine, the combnation of a rotary scre'en, a easing in which said screen is mountedl a shaft supporting one end, only of said screen, the opposite end of the screen being unsupported, hearings supporting said shaft for rotation, and. centrifugal means for preventing the escape of liquid at the Iunsupported end of said screen. f

1.7. In a pulp screening machine, the com hination of a rotary screen, a'casing' in which said screen is mounted, a shaft supporting one end only of said screen, the opposite end of the .screen loeing.v unsupported, a stationary plate partially' closing the latter end of the screen and having an opening therethrough, means for conducting pulp to said opening, and blades rotating Withsaiol screen and cooperating With said stationary plate to prevent the escape of liquid from.

' the casin means for drivin@r the',

llo'

18. in a pulp scrcenlng machine, the comhir-ration olf a pair of rotatable screens, a

lui imion nil.

airl Screen iapiljff" means for c011-v msm@ but being 'inclined wili reference to the a-Xis of said screen.

f 20. ln a pulp screening machine, the combination of a, rotary screen9 means 'foi' 10- tating said screen inpidly, means for coucluctiiig' pulp i3-0 be screened into said screen, and a plurality of bars mounte therein closely adjacent to the screening surface tlierem 21ml extending longitudinally of the screen but being so inclined as to u'fge the tailings lonfr 4the surface of the screen toward the tailings outlet. 

